Alright, let's work through 1288 times 663 step by step
1288 × 663 = 663 × (1288)
+ 663 × 8 giving us 5304
+ 663 × 80 producing 53040
+ 663 × 200 what gives us 132600
+ 663 × 1000 yielding 663000

= 853944
